Question 6

The Correct Answer is A **Explanation for Option A (Correct Answer):** This scenario is governed by the International Regulations for Preventing Collisions at Sea (COLREGs), specifically Rule 9 (Narrow Channels) and Rule 34 (Manoeuvring and Warning Signals). 1. **Rule 9(e)(i) (Overtaking in Narrow Channels - International Only):** When overtaking a vessel in a narrow channel is only possible if the vessel being overtaken takes action (as is implied by the phrasing of the question), the overtaking vessel must initiate the process by signaling its intention. 2. **The Signal:** The required signal for requesting permission to overtake on the vessel's **port side** is **two prolonged blasts followed by two short blasts** (— — • •). This signal communicates the desire to overtake to port, while simultaneously requesting the necessary agreement/action from the vessel ahead. **Explanation of Incorrect Options:** * **B) Sound two prolonged blasts on the whistle:** Two prolonged blasts (— —) is a signal used in restricted visibility (Rule 35) or, incorrectly, as a potential warning signal, but it is not the prescribed signal for requesting permission to overtake on the port side in a narrow channel. * **C) No signal is necessary:** A signal is mandatory in this specific international scenario under Rule 9(e)(i). Since the vessel being overtaken has to take action, the overtaking vessel must communicate its intentions and request permission. Relying on visual observation alone is insufficient and non-compliant. * **D) Sound two short blasts:** Two short blasts (••) signals a specific manoeuvre ("I intend to alter my course to port") under Rule 34(a)(ii). While it relates to changing direction, it is not the specific, required signal for requesting permission to overtake another vessel on its port side in a narrow channel.